#include <iostream>
using namespace std;

int main()
{
    //转义字符
    //换行符 '\n'
    cout << "Hello World!\nThis is a test.\n";
    //反斜杠 '\\'
    cout << "\\" << endl;
    //水平 制表符 '\t'
    cout << "a\ta\ta\t" << endl;

    return 0;
}